Drilling apparatus



Sept. 16, 1930. o. E. MUBPHY DRILLING APPARATUS 2 Sheets-Sheet 1 Filed Dec. 3, 192'! llllllh l l 3mm 0 1 7. 017/; y

Sept. .16, 1930. o. E. MURPHY I 1,775,774

DRILLING APPARATUS Filed Dec. 3, 1927 2 Sheets-Sheet 2 Patented Sept. 16, 1930,

VTUNITEFD, STATE-S:

PATENT OFFICE;

ORVILLE 1 iurmr'rnnor SHAWNEE; o LAHoMA, ASSIGNOR- or Fon'rY-NINE PER cam: TO,.A MERICAN IRON & MACHINE WORKS, me, or OKLAHOMA orrxoxranome,

A CORPORATION OF OKLAHOMA;

' DRILLING APPARATUS Application filed beeember ii, 192?. Serial No. 237,524.

1 -,This invention relates to drilling appa ratus and more particularly to reaming at tachments for rock bitsof the roller type. Roller rock bits are now. practically uni ;versally used in rotary drilling operations.

In these operations, it is often necessary that the operator be ablefto drill a hole of con siderable size, assuch increased diameterof,

the hole isoften necessaryfor a short distance in the well toenable a large sized pipe it is impractical to provide rock bits of a size for cutting these holes. 7 Accordingly, an important object ofthe invention is to pro vide an attachment for rock bits, whichmay be applied to a well known rock bit structure without in any manner altering the present structure thereof other than the removal of certain parts which are not employed and" which will enable theproduction of a hole of. i

a desired diameter greatly increased over a hole ordinarilyproduceable with the bit. V A further objectof the inventionflisto produce a device of thischaracter'whichmay be veryreadilyand cheaply constructed andwhich may be easily applied to the bit and removed therefrom a A J Y I These andotherobjects I attain by the construction shown in the accompanying drawings, wherein for the purpose of illus tration is shown a preferred embodiment" of my invention and wherein p j Figure 1 is a side elevation showing an attachment constructed in accordance with my invention applied to a roller rock bit;

Figure 2 is a transverse sectional view thereth 'ough; V a

Figure 3 is'a view withthe sections of the bit separated, one of-the attachments being shown in partial section; V V

Figure 4 is a 'view of a slightly'modified attachment removed'from the drill.

Referring now more particularly 'to the drawings, the numeral 10 generally designates'a rock bit body having at its lower end Iock bits 11 for engaging the bottom of the hole. These rock bits are usually provided in their side Walls at diametrically opposed points with chambers 12 for the reception of rotary reaming tools, -the peripheries of which-extend slightly beyond the outer face 7 of the bit and are adapted to engage the side Wall ofthe well bore. These rotary cutters are held in position by vertically extending pins 13 about which they rotate. In the ordinary rock bit construction, the bit is,

formed in two sectionsl l, adjacent faces of a which are recessed to form 0ne-half of the roller'cutter Chamber and one-half of the to be set. Drilling such a la fge hole is, of course, impossible with a small rockrbit and bearings for opposite endsof the pin 13.

The chambers 12, opposed wallsof which are 7 arcuately curved, areordinarily connected v 'vide a body 16 fittingthe curved walls of the chambers 12 andhaving an axial aperture 17 for the passage of the pin 13. Alongone side, thisbody has a vertically'extending rib V v 18 which, when the body is in position in the chamber 12, fitsbetween confronting;

walls of the transversepassageia so that. the'body isheld from rotating upon thepin. An outer structure 19 is provided at the opposite side of the body which is of just the same thickness as the width of the opening at the outer end of the chamber and through which the roller cutters ordinarily project. This outer structure supports a cutter,20 which, in Figure l, is disclosed as a blade resembling one'of'the blades of an ordinary fishtail bit and in Figure 4 has a rockbit cutter 21 similar to the rock bitcutters em: ployed at the lower end of the bit. i y It will be'obvious that in order t changej over a bit to enable the same to cut a bore of greater diameter with the use of my in ,vention,fall that is necessary is to remove the retaining bolts 22 by means of which. the sections 14 of the bit are held in assembled relation, separate the sections of thebit, re: move. the'rollers from the pins 13 and sub stitute therefor the body structure 16 pro duced in accordance with my invention when thebit maybe reassembled. It'will also be obvious that any suitable type'of blademight might be altered in any suitablemanner just as, a

be provided and that the structure employed i as long as the feature of preventing oscillation of the installed cutter is prevented and a rigid mounting therefor provided. I accordingly do not limit myself to the specific structure hereinbefore set forth except hereinafter claimed.

I claim:

1. The combination with a roller rock bit having chambers in its side walls and pins extending through said chambers and having their ends mounted in the upper and lower Walls of the chambers, of bodies having apertures for the passage of the pins fitting within said chambers and having engagement with the walls thereof maintaining the bodies rigid to the bit, the bodies having portions extending to the exterior of the bit and cutters carried by said portions.

2. The combination with a roller rock bit having substantially cylindrical chambers in its side walls and pins extending through said chambers and having their ends mounted in the upper and lower end walls of the chambers, of cylindrical bodies having longitudinal apertures for the passage of the pins fitting within the chambers and having portions extending to the exterior of the bit and cutters carried by said portions.

3. The combination with a roller rock bit having chambers in its side walls, the chambers having sockets in their upper and lower ends and pins having their ends fitted in said sockets and extending through the chambers, the body of the bit having a transverse passage connecting the chambers, of bodies fitting within the chambers having apertures for the passage of said pins and having portions extending into the adjacent ends of the transverse passage whereby they are held from oscillation upon the pins, said bodies having further portions extending to the exterior'of the bit and provided with cutters.

4. The combination with a roller rock bit having diametrically oppositely positioned longitudinally extending chambers formed therein and opening through the wall thereof, the chambers having sockets at their upper and lower ends and pins extending longitudinally therethrough' and having their ends fitted in said sockets, of cylindricalbodies each designed to fit within one of said ch ambers with a portion of the periphery thereof projecting therefrom, each of said bodies having a longitudinal passage for the reception oi. a pin, means carried by each of said bodies and engaging the bit for holding the bodies against oscillationupon the pins, and a cutter element carried by each body upon the pro jecting peripherial portion thereof.

5. The combination with a roller rock bit having diametrically oppositely positioned longitudinally extending chambers formed therein and opening through the wall thereof, the chambers having sockets at their upper and lower ends and pins extending longitudinally therethrough and having their ends fitted in said sockets, the body of the bit having a transverse passage connecting said chambers, of cylindrical bodies designed to fit within said chambers, each having a longitudinal passage formed therethrough for the reception of a pin, a portion of the periphery of each of said bodies projecting through the open portion of the chamber beyond the wall of the bit, a longitudinally extending rib formed upon each of said bodies andextending into said transverse passage for preventing oscillation of the bodies upon their pins, and cutter elements formed upon the projecting peripherial portion of the bodies.

6.*Th'e combination of a bit head made up of two connected sections, and having oppositely arranged pockets entering from the sides thereof and communicating with each other, each of said pockets having its side walls,at approximately the center thereof, concaved and the outer passage of each of the pockets being wider than the inner passage thereof, blocks shaped complemental to the walls oi the pockets and received therein and projecting therefrom, and a bit carried by each block and having its cutting surface disposed outwardly with respect to the block,

7 The combination of a bit head made up of two connected sections, and having oppositely arranged pockets entering from the sides thereof and communicating with each other, each of said pockets having its side walls, at approximately the center thereof concaved and the outer passage of each of the pockets being wider than the inner passage thereof, the upper and lower walls of the pockets being centrally formed with round openings, blocks shaped complemental to the signature. V

ORVILLE E. MURPHY. 

